removed travis as compiling takes too long

README.md

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 ArangoDB
 ========
 
-1.4: [![Build Status](https://secure.travis-ci.org/arangodb/arangodb.png?branch=1.4)](http://travis-ci.org/arangodb/arangodb)
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-2.3: [![Build Status](https://secure.travis-ci.org/arangodb/arangodb.png?branch=2.3)](http://travis-ci.org/arangodb/arangodb)
-2.4: [![Build Status](https://secure.travis-ci.org/arangodb/arangodb.png?branch=2.4)](http://travis-ci.org/arangodb/arangodb)
-2.5: [![Build Status](https://secure.travis-ci.org/arangodb/arangodb.png?branch=2.5)](http://travis-ci.org/arangodb/arangodb)
-2.6: [![Build Status](https://secure.travis-ci.org/arangodb/arangodb.png?branch=2.6)](http://travis-ci.org/arangodb/arangodb)
-2.7: [![Build Status](https://secure.travis-ci.org/arangodb/arangodb.png?branch=2.7)](http://travis-ci.org/arangodb/arangodb)
-2.8: [![Build Status](https://secure.travis-ci.org/arangodb/arangodb.png?branch=2.8)](http://travis-ci.org/arangodb/arangodb)
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-3.0: [![Build Status](https://secure.travis-ci.org/arangodb/arangodb.png?branch=3.0)](http://travis-ci.org/arangodb/arangodb)
-3.1: [![Build Status](https://secure.travis-ci.org/arangodb/arangodb.png?branch=3.1)](http://travis-ci.org/arangodb/arangodb)
-3.2: [![Build Status](https://secure.travis-ci.org/arangodb/arangodb.png?branch=3.2)](http://travis-ci.org/arangodb/arangodb)
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 Slack: [![ArangoDB-Logo](https://slack.arangodb.com/badge.svg)](https://slack.arangodb.com)
 
 ArangoDB is a multi-model, open-source database with flexible data models for